Is there a way to save the textures used inside a .blend file to a PC?
To import all the materials used in an old blend file, use the Append function. If the images that are used in the appended materials are not packed into the blend file but are saved in a folder, make sure that you don't remove this folder, otherwise your new file won't be able to find them automatically. If the images were packed in the old file they will automatically be in the new one.

You can export all the images packed into a folder with File &gt; External Data &gt; Unpack All Into Files, if you want to keep the images packed into the file, don't save the file when closing.